Gemstone



FIG. 1 is a top plan view of a gemstone, showing my new design;

FIG. 2 is bottom plan view thereof;

FIG. 3 is an upper perspective view thereof;

FIG. 4 is a front elevational view thereof, rear, right, and left elevational views being the same; and,

FIG. 5 is a 45-degree elevational view thereof, the 135, 225, and 315-degree elevational views being the same. 

CLAIM The ornamental design for a gemstone, as shown and described. 